Drive mechanism for mills



T. C. CAMPBELL.

DRIVE MECHANISM FOR MILLS. I APPLICATION FILED JAN*.22, 1920.

1,384,741 Patented July 19, 1921 3 SHEETSSHEET l.

Thomas C. CanyaeZZ,

T. C. CAMPBELL.

DRIVE MECHANISM FOR MILLS.

APPLICATION FILED JAN-22, 1920.

1,384 741 Patented July 19, 1921.

3 SHEETS-SHEET 2.

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ATTORNEYS I T. c. CAMPBELL.

DRIVE MECHANISM FOR MILLS. APPLICATION FILED JANIZZ 1920. 1,384,741 Patented July 19, 1921.

3 SHEFTS-SHEET 3.

,Tkomcza C. Caweil,

A TTORJVE Y? THOMAS C. CAMPBELL,'OF OWENSBORO,

KENTUCKY, ASSIGNOR T01 THE ANGLO- AMERICAN MILL COMPANY, or OWENSBORO, KENTUCKY.

., DRIVE MECHANISM FOR MILLS.

Specificationof Letters Patent. Patented J 11y 19, 1921,

Application filed January 22, 1920. Serial No. 353,155.

To all whom it may obncem:

Be it known that I, THOMAS C. CAMPBELL, a citizen'of the United States, residing at 'fOwensboro, in the county of Daviess and State ofKentucky, have invented new and useful Improvements in Drive Mechanism for Mills, of which the following is a specification.

This invention relates to an improved drive for mills and has as its object the pro vision of a mechanism which will overcome many of the present objections to mills due to their drive construction, all as hereinafter;

more in detail described.

In this description, it should here be stated that the invention is shown as applied to a mill of the character shown in the patent to A. R. Tattersall, 1,037,805, September 3, 1912, the mill therein shown being of the character in which the break and reduction rolls, by which the grain is reduced or ground up, and the centrifugal dressing devices are placedin close proximity to one another for short milling as distinguished from the long method of milling of some types of mills. It will be understood, however, that while the invention is herein shown and described as applied to this type of mill, its application is not so limited, but the same is adapted for use upon other'types of mills.

One of the principal objections now had to mills of the type above referred to is the noise of their operation due to the meshing of the gears which drive the rolls and centrifugals, and it has long been desired to eliminate this noise and at the same time retain the desired differential between the movements of the various, parts.

Another defect which users of inills of this type have noticed and have to contend with is the fact that it is often necessary to renew the break rolls which are of grooved construction, as these grooves often lose their depth and the roll must then be regrooved. When the user of the mill finds that these rolls are wearing, it is-necessary for him to remove them from the mill and return the same to the factory for the renewal operations. It should be clear that when these rolls are regrooved their diameter is somewhat decreased, and when replaced in the mill their shafts take a position slightly nearer the shaft of the associated roll. When this operation is performed upon the rolls of a mill bearing.

such as is shown in the above referred to Tattersall patent, there must be an adjustment of the driving gears, one gear being 10- cated upon the shaft of each roll; It is also I often necessary to change the gears to allow for the variation in the diameter of the worn rolls.

This invention has as its object the elimination of the above mentioned defects in mills by the substitution for gearing of a chain and sprocket drive. It has been attempted heretofore to eliminate'a great number of the gears in these mills by the provision of a pulley and belt drive, butithas been found in practical use that due to the slippage of belts the .proper differential cannot at all times be maintained. So far as I am aware tory chain and sprocket drive, and to eliminate the hereinbefore mentioned defects of these mills.

Referring to the accompanying drawings, wherein one embodiment of my invention is shown as applied to'a particular type of mill,

Figure 1 is a sectional elevation of a portion of the rolls and centrifugals, and

Fig. 2 is an end elevational view of the mill.

Fig. 3 is a detail of one of the driving units.

As shown in the previously referred to patent to Tattersall, and as indicated in the accompanying drawings, the reference numerals 90'and 91 designate a two-chamber casing supported by a suitable frame; These casings are designed to be dust tight and in one, 90, are located the sets of break and reduction rolls and in the other, 91, the reels having therein beaters for dressing the stock delivered thereto by means of screw conveyers extending from the casing 90 atpoints beneath the pairs of break and reduction rolls.

In the accompanying drawings, the two rolls 1, 3, constitute the first pair of break rolls, the rolls 11, 17, the second pair of break rolls and the reduction rolls are indicated by the numerals 20, 23, and 29, 31.

Beneath each pair of break and reduction rolls is located a conveyer shaft 37 supported at one end in a bearing 37?, and at its opposite end (not shown) inxa similar Each of these shafts extends from the housing 90 into the housing 91' and with in this latter housing carries spiders 38 which support beater blades 39 adapted. to

v I am the first to provide for mills a satisfacbeat up the stock within the usual reels 4:0; The manner in which the stock passes through such a mill as is shown in the accompanyingdrawings is all shown and described in the patent above referred to, and it is unnecessary to duplicate that descrip-* tion in this specification since the operation of such mills is well known in the-artyand :pan ing drawings.

. T 1e drive mechanism comprises four disthe present inventionrelates exclusively to the drive mechanism shown in the accom- '1 tinct driving units A, B, C and D, each unit each ofthese units is identical, it will be necessary for the purposes of this descripfconsistin'g ofa pair of rolls and the associated conveyer shaft 37 As the drive for tion to describe'in detail only one of these units. Upon the shaft extension 26 of each of the upper, orslow, rolls 1, 11, and :29 4 is located a sprocketfl, and directly below thisv sprocket upon the shaft extension 27 of Qeach-ofthe lower, or fast, rolls 3, 17, 23, and j 31 a sprocket 4, both of the sprockets being keyedto theshafts which as will be observed are supported in bearings 5. Adj acente'ach ing is an idler sprocket 6. As vvill be observed from an inspection of Fig. 2, the

, 'conveyer shaft 37 extends through the housing ,90" and has keyed thereto sprockets 9 around which iswlooped a chain 10 whose. links are engaged in the manner shown in Figs. 1 and 3 with the sprockets of the two 2 rolls. and the idler sprocket. It will be ob served that the sprockets of the rolls 1 and 3 are of different size to permit a differential movement between these two rolls and by looping the chain 10 around the idler 6 the: rollers1,and3 rotate in opposite directions.

Each of. the driving. units A, B, C and D, isv transmitted power from a pulley 16 adapted-tobe driven by a belt from any suitable source offpowerlandlocatedupon the shaft 12 which is merelyan extension of theashaftof. the lower roll..17 ofthe second i pair of break rolls... Thisshaft 12 carries a sprocket 13; which istraversed by a chain 14 loopedaround sprockets 15 upon extensions, of the conveyer shafts 37 and sprocket 16 uponshaft 27 of fast roll 31; and thus each of the driving units may be transmitted power from the central shaft 12.

and durability, possesses the distinct advantages hereinbefore mentioned, namely, an elimination of gearing and itsjiiattendant noise, a decrease of friction thus permitting the mill to be driven by less power and thirdly the elimination of the numerous adjustments necessary with a'gear drive.

1 Having thus described myinvention what is claimed is:

1; In a self contained mill having a roll section andacentrifugal section,-, pairs of rolls in said roll section, centrifugals in said centrifugal section, a conveyer adjacent. each pair of rolls and means for actuating each member of said pairs of rolls in opposite directions and simultaneously actuating said conveyor, sa d means COIIllDllSlIlgQSPIOCkGtS associated with each roll and eachconveyer and a chain engaging the sprocketsof each pair of rollersand the sprocket of tlie'adjacent conveyer. 4

2. In a mill of the class described having a roll section and a fcentrifugal section, a plurality of pairs of near rolls and reduction rolls in said roll section, a plurality of centrifugals'in said centrifugal section for receiving the stockfrom saidpairs of rolls,

a conveyer adjacent eachpair of rolls for transferringlthe stock to a centrifugal, a

sprocket associated witheach roll, a sprocket assoclated wlth each conveyer,. a chain looped over the sprockets of each pair of rolls and the sprocket of .the adjacent conveyer forming a plurality of driving. units, and means for transmitting power toeach of said units. i i

a In a an contained an, aplurality of pairs of break and reduction rolls, aplumayo-r centrifugals, a conveyer..forfeach pair of rolls for; transferring the, stock to. a

roll, a sprocket connected toea'ch" conveyer, a chain looped over the sprockets'of each pair of rollsand the sprocket of its'adjacent conveyer forming a plurality" of driving -units, a main power shaft and a chain transof said shaft in each of'sa'id reels, stock Itshoul'd be. understood, that while l have; 1

vend r a deppl e this emb d n o particulartype of mill, my: invention is not.

sp o ktpffl e yi mg sparsity sf;- driving 'iinits, aenpm 1.05 centrifugal, a sprocket connected to each i power shaft and a chain for transmitting power from said shaft to each of said driving units.

5. In a mill of the class described, a roll section, a centrifugal section, a plurality of pairs of rolls in said roll section, a plurality of reels in said reel section, a shaft adjacent each pair of rolls and having a screw conveyer thereon, extensions of said shafts in each of said reels, beater blades on the shaft extensions and means for driving said pairs of rolls and their adjacent conveyer and heater shafts, said means comprising a sprocket connected to each of said rolls, a sprocket on each of said shafts, a chain looped over the sprockets of each pair of said rolls and the sprocket of the adjacent conveyer shaft thereby forming a plurality of driving units, a central power shaft, a sprocket on said shaft and a chain looped over the sprocket of said power shaft and a sprocket in each of said driving units whereby power is transmitted to each of the driving units.

6. In a self contained mill having a roll section and a centrifugal section, pairs of rolls in said roll section, centrifugals in said centrifugal section, a conveyer adjacent said pairs of rolls and means for actuating each member of said pairs of rolls in opposite directions and simultaneously actuating said conveyer, said means comprising sprockets associated with each roll and the conveyer and a chain engaging the sprockets of each pair of rollers, at least one of said chains engaging the sprocket of the conveyer.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS C. CAMPBELL.

lVitnesses M. L. HowLETT, E. U. HEAD. 

